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LettersThis Week's LettersIan Wilmut, the cloner of Dolly the sheep, questions whether "the interpretation of the data offered" by the subsequent cloners of calves is "justified on the basis of the evidence presented." And several letter writers discuss whether "human longevity" can be "predicted by the simple extrapolation of mortality trends."
Letters in This IssueHow to Submit a Letter to the Editor
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Science. ISSN 0036-8075 (print), 1095-9203 (online)